Method of producing electrode for capacitor

Abstract

The present invention provides a method of producing an electrode for electric double layer capacitor, which yields the electrode having excellent electrode characteristics with good production suitability, using a coating material exhibiting a good dispersion state. A method of producing an electrode for a capacitor, the method comprising the steps of: applying an undercoat layer coating material which comprises at least electrically conductive particles, a binder and a solvent onto the current collector to form the undercoat layer; and applying an electrode layer coating material which comprises at least a carbon material, a binder and a solvent onto the undercoat layer to form the electrode layer. In the preparation of the undercoat layer coating material and / or in the preparation of the electrode layer coating material, dispersing treatment is conducted with ceramic beads as a dispersing medium.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a method of producing an electrode for an electric double layer capacitor. [0003] 2. Disclosure of the Related Art [0004] Electrochemical capacitors, a typical example of which is an electric double layer capacitor, are expected, for example, as backups for power sources of portable devices (small-sized electric devices) and others, auxiliary power sources for electric automobiles or hybrid automobiles, and the like. Various investigations for improving the performance of the capacitors have been made. [0005] As portable devices and others have been becoming smaller and lighter in recent years, it has been particularly required to make an electric double layer capacitor smaller and lighter while the capacitor keeps sufficient performances required for devices on which the capacitor is to be mounted. In other words, an improvement in energy density per unit mass of an electric double ...

AI Technical Summary

Benefits of technology

The present invention relates to a method for producing an electrode for a capacitor that has excellent electrode characteristics with good production suitability. The method involves preparing an undercoat layer coating material by dispersing treatment using ceramic beads as a dispersing medium, and then applying it onto a current collector to form the undercoat layer. An electrode layer coating material is then applied onto the undercoat layer to form the electrode layer. The resulting electrode exhibits good adhesive properties between the current collector and the electrode layer. The invention also provides a method for producing an electrode with a thinner electrode layer and a lighter electrode by using a coating material with good dispersion state.

Problems solved by technology

However, a case where the dispersion state is insufficient in these coating materials may be observed.